Chery T21 2014 Service Manual page 1112

25 - BRAKE CONTROL SYSTEM
Problem Repair (No DTC)
If there is a problem in brake system, but no DTC is stored in ABS control module assembly, this problem is
called a problem without DTC. A problem without DTC is caused by basic brake system malfunction. For
example:
1. Brake fluid leakage (it may result in weak braking, brake pedal overtravel, or even ineffective braking).
2. Using inferior brake fluid (it can result in corrosion of brake line and ABS hydraulic regulating module
internal elements, or even ineffective braking).
3. Air in brake line (it may result in weak braking, or even ineffective braking).
4. Brake line blockage (it may result in hard braking, or even ineffective braking).
5. Excessive wear of brake disc (it may result in weak braking, brake pedal overtravel).
6. Brake booster malfunction (it may result in weak or hard braking, brake pedal overtravel, or even
ineffective braking).
7. Wrong brake line connection (it may result in braking performance decreasing, drift, long braking distance
etc.).
HINT:
 ABS interrupted due to no power supply or power supply abnormality will cause the ABS warning light
remains on without storing DTC.
 Troubleshooting method: check corresponding component according to the malfunction, repair or replace
as necessary.
DTC Confirmation Procedure
Confirm that battery voltage is normal before performing the following procedures.
 Turn ignition switch to LOCK.
 Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC).
 Turn ignition switch ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the ABS control module
assembly.
 Turn ignition switch to LOCK and wait for a few seconds.
 Start engine, drive the vehicle at 20 km/h or more and perform road test with X-431 3G diagnostic tester
connected to Data Link Connector (DLC).
 Using X-431 3G diagnostic tester to select "Read Code".
 If DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
 If DTC is not detected, the malfunction indicated by the DTC is intermittent. Please refer to Intermittent
DTC Troubleshooting.
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Chery Automobile Co., Ltd.